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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from synapse.api.constants import EventTypes
from synapse.storage import DataStore
from synapse.storage.event_federation import EventFederationWorkerStore
from synapse.storage.event_push_actions import EventPushActionsWorkerStore
from synapse.storage.events_worker import EventsWorkerStore
from synapse.storage.roommember import RoomMemberWorkerStore
from synapse.storage.state import StateGroupWorkerStore
from synapse.storage.stream import StreamStore
from synapse.storage.signatures import SignatureWorkerStore
from synapse.util.caches.stream_change_cache import StreamChangeCache
from ._base import BaseSlavedStore
from ._slaved_id_tracker import SlavedIdTracker
logger = logging.getLogger(__name__)
# So, um, we want to borrow a load of functions intended for reading from
# a DataStore, but we don't want to take functions that either write to the
# DataStore or are cached and don't have cache invalidation logic.
#
# Rather than write duplicate versions of those functions, or lift them to
# a common base class, we going to grab the underlying __func__ object from
# the method descriptor on the DataStore and chuck them into our class.
class SlavedEventStore(EventFederationWorkerStore,
RoomMemberWorkerStore,
EventPushActionsWorkerStore,
EventsWorkerStore,
StateGroupWorkerStore,
SignatureWorkerStore,
BaseSlavedStore):
def __init__(self, db_conn, hs):
super(SlavedEventStore, self).__init__(db_conn, hs)
self._stream_id_gen = SlavedIdTracker(
db_conn, "events", "stream_ordering",
)
self._backfill_id_gen = SlavedIdTracker(
db_conn, "events", "stream_ordering", step=-1
)
events_max = self._stream_id_gen.get_current_token()
event_cache_prefill, min_event_val = self._get_cache_dict(
db_conn, "events",
entity_column="room_id",
stream_column="stream_ordering",
max_value=events_max,
)
self._events_stream_cache = StreamChangeCache(
"EventsRoomStreamChangeCache", min_event_val,
prefilled_cache=event_cache_prefill,
)
self._membership_stream_cache = StreamChangeCache(
"MembershipStreamChangeCache", events_max,
)
self.stream_ordering_month_ago = 0
self._stream_order_on_start = self.get_room_max_stream_ordering()
# Cached functions can't be accessed through a class instance so we need
# to reach inside the __dict__ to extract them.
get_recent_event_ids_for_room = (
StreamStore.__dict__["get_recent_event_ids_for_room"]
)
has_room_changed_since = DataStore.has_room_changed_since.__func__
get_membership_changes_for_user = (
DataStore.get_membership_changes_for_user.__func__
)
get_room_events_max_id = DataStore.get_room_events_max_id.__func__
get_room_events_stream_for_room = (
DataStore.get_room_events_stream_for_room.__func__
)
get_events_around = DataStore.get_events_around.__func__
get_recent_events_for_room = DataStore.get_recent_events_for_room.__func__
get_room_events_stream_for_rooms = (
DataStore.get_room_events_stream_for_rooms.__func__
)
get_stream_token_for_event = DataStore.get_stream_token_for_event.__func__
_set_before_and_after = staticmethod(DataStore._set_before_and_after)
_get_events_around_txn = DataStore._get_events_around_txn.__func__
get_room_max_stream_ordering = DataStore.get_room_max_stream_ordering.__func__
get_all_new_events_stream = DataStore.get_all_new_events_stream.__func__
get_federation_out_pos = DataStore.get_federation_out_pos.__func__
update_federation_out_pos = DataStore.update_federation_out_pos.__func__
def stream_positions(self):
result = super(SlavedEventStore, self).stream_positions()
result["events"] = self._stream_id_gen.get_current_token()
result["backfill"] = -self._backfill_id_gen.get_current_token()
return result
def process_replication_rows(self, stream_name, token, rows):
if stream_name == "events":
self._stream_id_gen.advance(token)
for row in rows:
self.invalidate_caches_for_event(
token, row.event_id, row.room_id, row.type, row.state_key,
row.redacts,
backfilled=False,
)
elif stream_name == "backfill":
self._backfill_id_gen.advance(-token)
for row in rows:
self.invalidate_caches_for_event(
-token, row.event_id, row.room_id, row.type, row.state_key,
row.redacts,
backfilled=True,
)
return super(SlavedEventStore, self).process_replication_rows(
stream_name, token, rows
)
def invalidate_caches_for_event(self, stream_ordering, event_id, room_id,
etype, state_key, redacts, backfilled):
self._invalidate_get_event_cache(event_id)
self.get_latest_event_ids_in_room.invalidate((room_id,))
self.get_unread_event_push_actions_by_room_for_user.invalidate_many(
(room_id,)
)
if not backfilled:
self._events_stream_cache.entity_has_changed(
room_id, stream_ordering
)
if redacts:
self._invalidate_get_event_cache(redacts)
if etype == EventTypes.Member:
self._membership_stream_cache.entity_has_changed(
state_key, stream_ordering
)
self.get_invited_rooms_for_user.invalidate((state_key,))
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